When I crinkle my nose after having Juvederm, I see two white blobs under the skin. Is this the Juvederm?

The two most common sources of white changes to the skin on the nose after a filler injection is that the filler has moved pearly white cartilage closer to the surface of the skin, or that the filler is white.  Radiesse is chalky white and if injected too close to the skin could be apparent.   There could also be some vascular compromise, causing the skin to blanch.  You need to have your injector take a look and make sure everything is safe for you.

   Juvederm may have produced the whitish discolorations.  If this is the case, more hyaluronidase can be injected.

Without a photo it is very hard to be sure, but...  It does not sound like Juvederm. 

As you know Juvederm is clear and the "tyndall" effect we sometimes see is actually bluish grey in color.  If you had hyaluronidase injected,  it should have dissolved.  Could it be Radiesse, which is white and doesn't break down with hyaluronidase? Cartilage, which is in your nose is also white, so there may be another explanation for what you see.